Vegetation Evolution in the Mountains of Cameroon During the Last 20 000 Years: Pollen Analysis of Lake Bambili Sediments

Assi-Kaudjhis, Chimène

doi:10.5772/30158

Cited by 3 publications

(2 citation statements)

References 40 publications

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“…Individual samples were at least 5 meters apart from each other in all four cardinal directions. The general topography and vegetation in each region have been described previously 13 , 14 . Once all the soil samples were collected, they were shipped to McMaster University in Canada, stored at 4 °C, and processed within 2 weeks after receiving.…”

Section: Methodsmentioning

confidence: 99%

Diversity and relationships among strains of culturable yeasts in agricultural soils in Cameroon

Aljohani

Samarasinghe

Ashu

et al. 2018

Sci Rep

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Yeasts are unicellular fungi; they are found in a diverse range of natural habitats, including soil, aquatic environments, the surface of plants, and the skin and mucosal surfaces of animal hosts. A variety of yeasts have been found in the soil environment. However, most studies of soil yeasts have come from developed countries, and there is a dearth of research on soil yeasts in Africa. In this study, we analyzed 493 soil samples from nine geographical locations in Cameroon for yeasts, using a culture - based method. A total of 110 yeast isolates were obtained. Based on their sequences at the fungal barcode locus, the Internal Transcribed Spacer (ITS) regions of the nuclear ribosomal RNA gene cluster, the 110 yeast isolates were putatively identified as belonging to 16 yeast species, including 15 Ascomycetes and one Basidiomycete. Differences in yeast species distribution were observed among the analyzed geographic regions. PCR fingerprinting analyses identified a large number of genotypes among strains within each of the obtained yeast species. Significantly, there was little evidence of geographic clustering among yeast strains from any of the yeast species. Our results suggest that Cameroon contains significant yeast diversity and that gene flow is common among local and regional soil yeast populations.

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Section: Methodsmentioning

confidence: 99%

Diversity and relationships among strains of culturable yeasts in agricultural soils in Cameroon

Aljohani

Samarasinghe

Ashu

et al. 2018

Sci Rep

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“…In Cameroun, Assi-kaudjhis [38] studied vegetational evolution in the Crater Lake Bambili which lies in the volcanic zone through the pollen analysis of sediments cored from two sites around the lake, a region located in the Guinean-Congolian forest belt. An inventory of the plant biodiversity was taken, and Annona senegalensis, Bridelia ferruginea, and Typha were found from 1600 m -800 m asl as savanna elements within the local vegetation.…”

Section: Understanding Vegetation Dynamics Using Percentage Representation Of Palynomorphs Recovered From Environmental Matricesmentioning

confidence: 99%

Understanding Past and Present Vegetation Dynamics Using the Palynological Approach: An Introductory Discourse

Obigba¹

2022

Vegetation Index and Dynamics

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Palynology is a multi-disciplinary field of science that deals with the study and application of extinct, [fossilised] and extant palynomorphs (pollen and spore) and other related microscopic biological entities in the environment. It is divided into palaeo- and actuo-palynology, and provides substantial proxies to understanding past and present vegetation dynamics respectively. With reference to the two geological principles of uniformitarianism and of the evolution of fauna/flora, the distribution of plant indicators across ecological zones, palynomorph morphology and pollen analysis, palynology can be used to identify the change in past and present local and regional vegetation and climate and humans impact on the environment. Other supportive areas of endeavour like radiocarbon dating, sedimentology, taphonomic processes and geomorphology can be used to triangulate inferences drawn from palynological data. Palynomorphs are made of outer cell walls embedded with an inert, complex and resistant biopolymeric signature (called sporopollenin) which helps to facilitate long term preservation in different environmental matrices under favourable conditions, hence its widespread applicability. Palynology have proven to very reliable in reconstructing past vegetation, decrypting essential honeybee plants and understanding the impact of climate on plant population using pollen analysis, for which is the basis for the application of palynology in environmental studies. The application of palynology in climate, vegetation and anthropogenic studies begins with the selection of matrix (sediments from lake, river, ocean, excavation, relatively intact soil profile, bee products), coring or collection of samples, subjection to a series of chemically aided digestion, separation, physical filtration, decanting, accumulating of palynomorphs, microscopic study and ends with the interpretation of recovered information. Literature review on the application of palynology for understanding vegetation and climate interactions is presented in this paper.

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A 30,000 yr Record of land-ocean interaction in the eastern gulf of Guinea

2013

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A 30,000 yr dinocyst and pollen record from the eastern equatorial Atlantic (off Cameroon) has been investigated in order to identify land–ocean linkages during the last deglacial transition. A strong correlation between the abundance of Brigantedinium spp. and the Ca/Fe ratio during the last glacial period suggests enhanced marine productivity in association with cool seawater temperatures and nutrient input linked to coastal upwelling and/or a proximal river mouth. Dry conditions are recorded on the adjacent continent with a significant representation of open vegetation indicators and the Afromontane taxon Podocarpus. After 17 calka BP these indicators register a sharp decline as a result of a climatic transition from the dry/cooler conditions of the last glacial period to the wetter/warmer conditions of the deglaciation. Simultaneously, dinocysts show a significant shift from dominant heterotrophs to an increasing abundance of autotrophs, reflecting warmer conditions. Significant changes are observed during the Younger Dryas, with a return to drier conditions and higher salinities. The start of the Holocene is marked by very low-salinity conditions, reflecting optimal monsoonal conditions over west equatorial Africa. The end of the African Humid Period is observed between 6 and 5 calka BP, followed by significant fluctuations in both terrestrial and oceanic proxies.

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Vegetation Evolution in the Mountains of Cameroon During the Last 20 000 Years: Pollen Analysis of Lake Bambili Sediments

Cited by 3 publications

References 40 publications

Diversity and relationships among strains of culturable yeasts in agricultural soils in Cameroon

Diversity and relationships among strains of culturable yeasts in agricultural soils in Cameroon

Understanding Past and Present Vegetation Dynamics Using the Palynological Approach: An Introductory Discourse

A 30,000 yr Record of land-ocean interaction in the eastern gulf of Guinea

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